How ChistaDATA helps companies globally in developing high-performance real-time analytics?

Once upon a time, in a rapidly evolving digital landscape, businesses faced the challenge of delivering real-time analytics to gain valuable insights and stay ahead of the competition. One company, ChistaDATA, emerged as a global leader in developing high-performance real-time analytics solutions, revolutionizing the way organizations harnessed the power of their data. In the vast […]

How do I know if the cardinality estimates in a ClickHouse plan are accurate?

In ClickHouse, evaluating the accuracy of cardinality estimates in a query plan can be challenging since ClickHouse relies on different heuristics and sampling techniques to estimate cardinalities. However, you can take the following steps to gain insights into the accuracy of cardinality estimates: It’s important to note that ClickHouse’s cardinality estimation is not always exact […]

How do I display and read the execution plans for a SQL statement in ClickHouse?

To display and read the execution plans for a SQL statement in ClickHouse, you can follow these steps using real-life data sets: For this example, we’ll use a simple SELECT statement to retrieve data from the orders table: SELECT customer_id, COUNT(*) AS order_countFROM ordersGROUP BY customer_idORDER BY order_count DESC; This query will calculate the number […]

How to identify Overlapping Date Ranges in ClickHouse?

To identify overlapping date ranges in ClickHouse, you can use SQL queries that compare the start and end dates of each range to determine if there are any overlaps. Here’s an example using a real-life dataset of employee vacation schedules: Assume we have a ClickHouse table called “vacation_schedule” with the following structure: CREATE TABLE vacation_schedule […]

Implementing Groupings, Rollups and Cubes in ClickHouse

Grouping, rollup, and cube are SQL query operations that allow for grouping and aggregation of data based on multiple dimensions or attributes. In ClickHouse, these operations are implemented using the GROUP BY clause, which allows you to group data based on one or more columns. Here are some real-life data examples to illustrate how to […]

Optimize Query Performance in ClickHouse with Derived Tables

Derived tables are tables that are created on-the-fly as a result of a query. They are temporary tables that exist only for the duration of the query, and are not stored in the database. ClickHouse supports derived tables as a way to simplify complex queries and reduce the amount of data that needs to be […]

Permutation via Recursion and Permutation via Cross Join in ClickHouse

Permutation is the process of arranging a set of elements in all possible orders. ClickHouse supports two methods for computing permutations: recursion and cross join. Here’s how each method works, along with real-life data examples and use cases. 1. Permutation via Recursion: The recursion method involves recursively selecting each element in the set and computing […]

Understanding SORT Operations and ordered property of Index Scans in ClickHouse

In ClickHouse, a SORT operation is used to sort data in a specified order, either ascending or descending. Sorting data can improve query performance when the data is accessed in a sorted order, such as when using an ORDER BY clause in a query. However, sorting large volumes of data can be resource-intensive and time-consuming. […]

clickhouse-copier – A reliable workhorse for copying data across ClickHouse servers

ClickHouse comes with useful tools for performing various tasks. clickhouse-copier is one among them and as the name suggests, it is used for copying data from one ClickHouse server to another. The servers can be from the same cluster or different cluster altogether. This tool requires Apache Zookeeper or clickhouse-keeper to synchronise the copying process […]